Hi Robert,
> NPU consumes 100W and serves 4 active links with each laser of 10W. > > So you can advertise each link with the PCPPS metric of (directly mapping) > 35. (25 as 100/4 + 10) Yes, you can do that, but you lose the relationship between the interfaces and you need that information if you want to power-sleep the NPU. You can imagine another set of 4 links tied to a different NPU in the same box. You’d like to consolidate traffic on one NPU or the other, but not power-sleep four random links and neither NPU. > How else would headend introduce Power Groups to the metric in CSPF ? As described in PCPPS, the metric modifcation involves the potential power savings of an interface and all of it’s parent power-groups, hierarchically. Otherwise, its cumulative PSP is equal to the interface's PSP plus the PSP of the interface's Parent Power Groups, recursively. Cheers, Tony
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